A scalable and efficient electrocatalytic dehydrogenative esterification is reported. With an indirect electrolysis strategy, both intra- and intermolecular-type reactions were amenable to this practical method. With n-Bu4NI as the catalyst, undesired decarboxylation and Baeyer–Villiger oxidation were suppressed. More importantly, this novel method provided reliable and direct access to the natural
We developed efficient aerobic photooxidative oxylactonizations of oxocarboxylic acids promoted by trifluoroacetic anhydride with molecular oxygen as the terminal oxidant in the fluorous solvent FC-72.
Preparation of α-Acyloxy Ketones via Visible-Light-Driven Aerobic Oxo-Acyloxylation of Olefins with Carboxylic Acids
作者:Qing-Bao Zhang、Yong-Liang Ban、Da-Gang Zhou、Pan-Pan Zhou、Li-Zhu Wu、Qiang Liu
DOI:10.1021/acs.orglett.6b02560
日期:2016.10.21
developed a visible-light driven oxo-acyloxylation of aryl alkenes with carboxylic acids and molecular oxygen. A metal-free photoredox system, consisting of an acridinium photocatalyst, an organic base, and molecular sieve (MS) 4 Å, promotes chemoselective aerobic photooxidation of aryl alkenes. This approach may provide a green, practical, and metal-free protocol for a wide range of α-acyloxy ketones.
Hypervalent Iodine(III) Sulfonate Mediated Synthesis of 5-Benzoyldihydro-2(3H)-furanone in Ionic Solvent
作者:Ling-Ching Chen、Rei-Sheu Hou、Huey-Min Wang、Yu-Chien Lin
DOI:10.3987/com-04-10301
日期:——
The room temperature ionic liquid, n-butylpyridinium tetrafluoroborate (BPyBF 4 ) is used as a "green" recyclable solvent for the reaction of 4-benzoylbutyric acid with [hydroxy-(2,4-dinitrobenzenesulfonyloxy)iodo]-benzene(HDNIB) to prepare 5-benzoyldihydro-2(3H)-furanone.
A direct and efficient method for the preparation of 5-benzoyldihydro-2(3H)-furanones was realized by cyclization of 4-benzoylbutyric acids in the presence of phenyliodine(III) triflate.